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Rangers debutante Gavin Rae tackles Celtic's John Hartson in a tightly-contested opening quarter of the Old Firm derby

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But the home side go ahead on 19 minutes when Stilian Petrov stoops low to head into the back of the net

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Celtic hold onto their lead until half-time and look on course for a repeat of the scoreline in the Old Firm derby last October

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Tempers run high as ever - referee Stuart Dougal steps in between Celtic's Alan Thompson and Fernando Ricksen of Rangers

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Celtic double their lead on the hour, Stanislav Varga (centre) taking advantage of some lazy Rangers defending to head the ball home

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Alan Thompson (right) curls in a free-kick on 84 minutes to seal victory and send Celtic 11 points clear at the top of the SPL